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VOLUME 29 (1979) | ISSUE 12 | PAGE 755
Transmission of short, strong thermal pulses through liquid helium
The relaxation of pulse perturbations in liquid helium was investigated. The width of the recorded pulses of the second sound increases with increasing amplitude of the ~ l-//sec exciting thermal pulse; at T< 1.87 К the leading edge of the pulse is shifted and at T> 1.87 the pulse decreases while its leading edge remains almost stationary. At Τλ — T< 0.2 К and T> Τλ +0.2 К the propagation of the pulses of the first sound can be recorded. The arrival in the receiver of the pulse of the first sound in He II corresponds to a decrease of the temperature and its arrival in He I corresponds to an increase in the temperature, i.e., in both cases a compression wave propagates from the heater in the liquid.